Attachment for jacks



Jan. 30, 1945. J. H. BISHOP ET AL I ATTACHMENT FOR JACKS Filed June 5, 1944 Patented Jan. 30, 1945 U NilTiED PATEN @OFFICE ATTACHMEN T FOR 'JACKS Joseph H. Bishop and wllliam flicooper, .Dayton, Ohio Application June'S, 1944,fSeritlNoJ538Q675 '6 Claims. (01154-433) (Granted .under the act of March'3, 1883, -as amended April30, 1928;370 0. G. 757) The invention described herein may bezmanufactored and 'used by or for "the Government for governmental purposes, without the payment to us of any royalty'thereon.

"This invention relates to an attachment "for jacks, and the'principal object is to provide such anatta'chment adapted particularly for hoisting anaviation supercharger into place'for-mountin'g the same on an'aviation engine.

The construction of the invention comprises a tiltable platform and supporting means for securing'the same universally to the extensible part of a jack whereby the platform 'may besupported upon the jack and tilted "in different planes. The securing means comprises-means for detachably securing the supporting means to the extensible part of the Jack. Meansare provided for rigidly maintaining the tiltable platform in any desired position'of tilt, said means comprising a plurality of struts universally "connected with the platform at spaced points thereonand common means universally connected with the ends 'of said struts remote from the platform. The said common means is adapted for association with the extensible part of a jack for movement relative thereto and means are associated with said common means for detachably securing the same in different fixed positions relative to said extensible part of the jack.

Each of the struts comprise a plurality of arms having pivotal connection with one another. Locking means are provided which are operable to lock the arms against pivotal movement when the same have been properly adjusted to support the platform at the desired angle of tilt.

The details of the invention will be apparent from the following description taken in conjunction with the accompanying drawing, in which:

Fig. 1 isa perspective view of the attachment of the invention showing the same secured to the extensible part of a jack.

Fig: 2 is a side elevation of the structure shown in Fig. l, certain parts thereof being shown in section.-

Now referring to the drawing for a detailed description of the invention, the ram or extensible part of a lifting jack is represented by the numeral I, the same being provided at the upper end thereof with a detachable jack pad comprising the rectangular block 2 which ordinarily engages the part which is to be lifted by the jack. Upon the extensible part I of the jack there is adapted to be mounted an attachment comprising a tiltable platform or table 3, which is universally connected by means of a standard type of universal-joint to a' supporting means '5. The supporting"means 5 "comprises a'irame including "a top6 which-rests upon the jack pad -2 of'theiackram I ,"said supporting means 5 also including side portions 1, 8, 9 and I 0 extending downwardly from 'the top portion 6, whereby when"'the "t'o'p "portion- B rests uponv'the block member-2fthe latter' is received -within'the enclosure provided'by the side members 1 to Ill. Preferably, theside' membersw and I 0 -clos'ely'fit the-respectiveopposite sides or the block 2, as illustrated in Fig. 2,=wliile"-'the' side members or flanges! andeare"spaced from opposite sides of the'blo'ck member Z. --Olamping-bo1ts II and I2 are threaded through "the side flanges "I and 9 respectively, and'the 'inne'r ends of said clamp-ing bolts are "adapted to-engagewhe respective adja cent'si'des of'theblo'ckmembe'r '2 'forsec'uring the supporting means' i'in place upon theextensible partdf the jack.

"The attachment also includes a-plurality of struts generally designated"by the numeral I3 which are" universally'connected with the platformor't'able3' atspaced points thereon. Preferably the struts I3 are universally connected with adjacent side or with one side and the adjacent end, respectively, of the table 3, as

shown in Fig. 1. Each of the struts I3 has its end remote from the table universally connected with a common means I4 which is adapted for association with the ram or extensible part of the jack for sliding movement relative thereto. Each of the struts I3 comprises an upper arm I5 and a lower arm I6, which are pivotally connected together by means of bolts I'I, upon which are provided wing nuts I8 which, when tightened up on the bolts II, serve to lock the arms I5 and I6 against relative pivotal movement for maintaining the platform or table 3 at the desired angle of tilt to which it has been adjusted.

The upper end of each arm I5 is universally connected to the platform or table 3 by means of a standard type of ball and socket universal joint I9, and the lower end of each of the lower arms I6 is universally connected by means of a similar ball and socket universal joint 20 to the common connecting means I 4 for the struts I3. This common. connecting means l4 comprises a collar which is slidably received on the jack ram I for sliding movement relative thereto. The collar I 4 is provided with an adjusting'bolt 2I threadingly associated therewith, the inner end of which bolt 2I is adapted to engage the jack ram I for adjustment of the collar I4 in different fixed positions relative to the jack ram I when the bolt 2| is tightened' Table or platform 3 may be provided with suitable straps 22 for attaching the supercharger thereto. The arms l5 and I6 may be formed with enlarged, somewhat circular portions He and Mia, respectively, the abutting faces of which are preferably roughened or serrated so that when the same are clamped together by the tightening up of the wing nut l8, the arms l5 and I6 will be more positively held against pivotal movement relative to one another.

In the use of the invention, the attachment may be secured to the jack ram by sliding the collar [4 into position thereon and clamping the same in a desired position by tightening the bolt 2|. The supporting means 5 rests upon the removable jack pad or block 2 and the supporting means 5 is clamped to the member 2 by tightening thebolts H and I2. been loosened, the table or platform 3 may be tilted to any desired position and then the wing nuts l8 are tightened to prevent relative pivotal movement of the arms l5 and I6 of each strut so as to rigidly maintain the platform 3 at the desired angle of tilt to which it has been adjusted. In adjusting the table or platform 3 to the desired angle of tilt, it may be desirable to loosen the nut 2| and slide the collar 14 along the jack ram l and then tighten the nut 2| tomaintain the collar I4 in a desired fixed position with respect to the jack ram l.

Thus it will be apparent that the invention provides a very rigid construction of jack attachment, including a tiltable table or platform capable of supporting the relatively heavy supercharger upon a lifting jack, said attachment providing means .for rigidly maintaining the table or platform in any desired position of tilt whereby to very greatly facilitate the operation of lifting the supercharger into place for mounting the same upon an aviation engine.

Having thus described our invention, we claim:

1. In an attachment for jacks, in combination,

The nuts [8 having g a tiltable platform, a supporting means therefor. a universal connection between said platform and said supporting means, a plurality of struts universally connected with said platform at spaced points thereon, and common means universally connected with the ends of said struts remote from said platform, said struts each comprising a plurality of arms having pivotal connection with one another.

2. An attachment as claimed in claim 1, and locking means operable to lock the arms of each strut against relative pivotal movement.

3. In an attachment for a jack having an extensible part, the combination of a tiltable platform, supporting means therefor, a universal connection between said platform and said supporting means, means for securing the supporting means to the extensible part of a jack, a plurality of struts universally connected to said platform at spaced points thereon, and common means universally connected with the ends of said struts remote from said platform, said struts each comprising a plurality of arms having pivotal connection with one another, the last means being adapted for association with the extensible part of a jack for movement relative thereto.

4. An attachment as claimed in claim 3, and means associated with the last means for detachably seeming said last means in different fixed positions relative to the extensible part of a jack.

5. An attachment as claimed in claim 3 wherein the securing means comprises clamping means for detachably securing said supporting means to the extensible part of a jack.

6. An attachment as claimed in claim 3 wherein the securing means comprises clamping means for detachably securing said supporting means to the extensible part of a jack, and means associated with said common means for detachably securing said common means in different fixed positions relative to the extensible part of a jack.

JOSEPH H. BISHOP. WILLIAM H. COOPER. 

